Any smaller change in their water chemistry can shock them harder than it would in a larger tank. Secondly, the smaller the tank- the faster a catastrophe can occur. Hey there! IвЂ™m so sorry to hear about your new fish, it can be so traumatic to lose them! My suggestion is to let your tank fully cycle to get all the good bacteria in there first things first. If your filter filters everything out after a 10% water change everybody be good to go and you will have a nice fresh aquarium for your fish. After everything is said and done your tank water should be crystal clear do not scrub the glass do not scrub the decorations leave everything in there use a plate to refill your water so it doesnвЂ™t move your rocks around.The 50% water change is only in a desperate situation is extremely dramatic would not recommend it. You will have to remove like 50% of the water if it doesnвЂ™t clear up. After you use your testing tool or kit in this case. Then recondition the water after removing 10% of the water if the water is needed to be removed by then. They are these fish that are called bristle nose just say the name to your local pet shop and they will be able to tell you whether they have them or not they are excellent algae cleaners and get yourself a snake python for one final water change. Then replace the filter with a brand new one.Let the water cycle through it for three weeks that will give your take enough time to balance out and youвЂ™ll be able to put in live plants also some new fish IвЂ™d also recommend a very good cleaning crew.

What I would do is let the water get cloudy after you remove all the fish. Not to mention your pH level is probably off also there might be an ammonia factor in there as well.

Think about it this way youвЂ™re in a garage and thereвЂ™s no fan in there itвЂ™s stuffy and youвЂ™re miserable. I understand your situation if you put fish in before you let the tank cycle youвЂ™re setting yourself up for disaster the old filter is great for the start of the cycling because it could have the good bacteria already in it.

30 gallon goldfish aquarium